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redis 127.0.0.1:6379> APPEND KEY_NAME NEW_VALUE

# APPEND to a non-existing key

redis> EXISTS myphone               # Ensure myphone does not exist
(integer) 0

redis> APPEND myphone "nokia"       # APPEND to a non-existing key, equivalent to SET myphone "nokia"
(integer) 5                         # Character length


# APPEND to an existing string

redis> APPEND myphone " - 1110"     # Length increases from 5 to 12 characters
(integer) 12

redis> GET myphone
"nokia - 1110"